1. Department of Computer Science and Engineering and the AI Institute, Shanghai Jiao Tong University, Shanghai, China
2. Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China
3. Wangxuan Institute of Computer Technology (WICT), Peking University, Beijing, China
4. National Engineering Research Center of Visual Technology, School of Computer Science, Peking University, Beijing, China
5. Institute of Image Communication and Network Engineering, AI Institute, Shanghai Jiao Tong University, Shanghai, China